ENH: Add support for float hex format to loadtxt.
ENH: Add support for float hex format to loadtxt.

Add _floatconv to npyio.py as a default floating point converter. This
uses float() as a type conversion with a fallback on (ValueError) to
float.fromhex().

Closes #2517.

grlee77/numpy,GrimDerp/numpy,sinhrks/numpy,Eric89GXL/numpy,bringingheavendown/numpy,githubmlai/numpy,empeeu/numpy,drasmuss/numpy,njase/numpy,tynn/numpy,WarrenWeckesser/numpy,pizzathief/numpy,has2k1/numpy,Linkid/numpy,Anwesh43/numpy,cowlicks/numpy,Eric89GXL/numpy,rajathkumarmp/numpy,simongibbons/numpy,mathdd/numpy,yiakwy/numpy,gmcastil/numpy,GaZ3ll3/numpy,maniteja123/numpy,MichaelAquilina/numpy,stuarteberg/numpy,jankoslavic/numpy,tacaswell/numpy,charris/numpy,Srisai85/numpy,SunghanKim/numpy,rherault-insa/numpy,cowlicks/numpy,mwiebe/numpy,Srisai85/numpy,bmorris3/numpy,kiwifb/numpy,Linkid/numpy,cowlicks/numpy,ahaldane/numpy,trankmichael/numpy,numpy/numpy,Yusa95/numpy,rudimeier/numpy,endolith/numpy,cowlicks/numpy,sonnyhu/numpy,joferkington/numpy,gmcastil/numpy,ChristopherHogan/numpy,cjermain/numpy,rajathkumarmp/numpy,musically-ut/numpy,githubmlai/numpy,mattip/numpy,ddasilva/numpy,mingwpy/numpy,leifdenby/numpy,rhythmsosad/numpy,sigma-random/numpy,pbrod/numpy,mindw/numpy,KaelChen/numpy,endolith/numpy,skymanaditya1/numpy,Eric89GXL/numpy,pyparallel/numpy,ESSS/numpy,tynn/numpy,ChanderG/numpy,SiccarPoint/numpy,bertrand-l/numpy,grlee77/numpy,dato-code/numpy,BMJHayward/numpy,jakirkham/numpy,madphysicist/numpy,BabeNovelty/numpy,ahaldane/numpy,jorisvandenbossche/numpy,naritta/numpy,groutr/numpy,anntzer/numpy,mattip/numpy,ESSS/numpy,ChanderG/numpy,seberg/numpy,mingwpy/numpy,KaelChen/numpy,CMartelLML/numpy,felipebetancur/numpy,ViralLeadership/numpy,rudimeier/numpy,mwiebe/numpy,dato-code/numpy,chatcannon/numpy,stuarteberg/numpy,GrimDerp/numpy,ddasilva/numpy,kirillzhuravlev/numpy,trankmichael/numpy,madphysicist/numpy,kiwifb/numpy,Anwesh43/numpy,WarrenWeckesser/numpy,pdebuyl/numpy,b-carter/numpy,endolith/numpy,mhvk/numpy,nbeaver/numpy,ekalosak/numpy,numpy/numpy,jorisvandenbossche/numpy,groutr/numpy,MaPePeR/numpy,empeeu/numpy,mathdd/numpy,rhythmsosad/numpy,ContinuumIO/numpy,sonnyhu/numpy,kirillzhuravlev/numpy,solarjoe/numpy,ajdawson/numpy,ekalosak/numpy,ekalosak/numpy,cjermain/numpy,MSeifert04/numpy,SiccarPoint/numpy,shoyer/numpy,mindw/numpy,solarjoe/numpy,groutr/numpy,gmcastil/numpy,utke1/numpy,maniteja123/numpy,ajdawson/numpy,dimasad/numpy,shoyer/numpy,shoyer/numpy,skwbc/numpy,rudimeier/numpy,felipebetancur/numpy,sinhrks/numpy,BabeNovelty/numpy,jankoslavic/numpy,rherault-insa/numpy,pdebuyl/numpy,empeeu/numpy,grlee77/numpy,njase/numpy,has2k1/numpy,simongibbons/numpy,skwbc/numpy,BMJHayward/numpy,jschueller/numpy,WarrenWeckesser/numpy,rudimeier/numpy,jakirkham/numpy,cjermain/numpy,pizzathief/numpy,BMJHayward/numpy,rajathkumarmp/numpy,pbrod/numpy,chiffa/numpy,skymanaditya1/numpy,ssanderson/numpy,moreati/numpy,kirillzhuravlev/numpy,tynn/numpy,mingwpy/numpy,WarrenWeckesser/numpy,jorisvandenbossche/numpy,argriffing/numpy,GaZ3ll3/numpy,maniteja123/numpy,ekalosak/numpy,rajathkumarmp/numpy,CMartelLML/numpy,ajdawson/numpy,nguyentu1602/numpy,Srisai85/numpy,WillieMaddox/numpy,madphysicist/numpy,mingwpy/numpy,hainm/numpy,stuarteberg/numpy,pdebuyl/numpy,dwillmer/numpy,githubmlai/numpy,dwillmer/numpy,stuarteberg/numpy,trankmichael/numpy,pbrod/numpy,chiffa/numpy,charris/numpy,WillieMaddox/numpy,behzadnouri/numpy,bertrand-l/numpy,Linkid/numpy,rmcgibbo/numpy,abalkin/numpy,dato-code/numpy,rmcgibbo/numpy,bertrand-l/numpy,nbeaver/numpy,pizzathief/numpy,jonathanunderwood/numpy,seberg/numpy,ChristopherHogan/numpy,jorisvandenbossche/numpy,mattip/numpy,gfyoung/numpy,nguyentu1602/numpy,drasmuss/numpy,Anwesh43/numpy,leifdenby/numpy,GrimDerp/numpy,mhvk/numpy,CMartelLML/numpy,sonnyhu/numpy,tacaswell/numpy,sinhrks/numpy,KaelChen/numpy,argriffing/numpy,rmcgibbo/numpy,ChanderG/numpy,rhythmsosad/numpy,simongibbons/numpy,musically-ut/numpy,ESSS/numpy,bmorris3/numpy,chiffa/numpy,skwbc/numpy,madphysicist/numpy,Dapid/numpy,mindw/numpy,rgommers/numpy,dimasad/numpy,hainm/numpy,bringingheavendown/numpy,sonnyhu/numpy,joferkington/numpy,ahaldane/numpy,joferkington/numpy,Yusa95/numpy,naritta/numpy,drasmuss/numpy,simongibbons/numpy,b-carter/numpy,Eric89GXL/numpy,tdsmith/numpy,yiakwy/numpy,SunghanKim/numpy,WillieMaddox/numpy,BabeNovelty/numpy,leifdenby/numpy,shoyer/numpy,MaPePeR/numpy,mortada/numpy,anntzer/numpy,gfyoung/numpy,ssanderson/numpy,ContinuumIO/numpy,pbrod/numpy,jankoslavic/numpy,skymanaditya1/numpy,rgommers/numpy,njase/numpy,MSeifert04/numpy,jakirkham/numpy,naritta/numpy,anntzer/numpy,pbrod/numpy,ChristopherHogan/numpy,KaelChen/numpy,Yusa95/numpy,jakirkham/numpy,joferkington/numpy,MichaelAquilina/numpy,ajdawson/numpy,behzadnouri/numpy,mortada/numpy,seberg/numpy,nbeaver/numpy,Anwesh43/numpy,musically-ut/numpy,MichaelAquilina/numpy,jschueller/numpy,Linkid/numpy,GaZ3ll3/numpy,MaPePeR/numpy,has2k1/numpy,numpy/numpy,mattip/numpy,jorisvandenbossche/numpy,sigma-random/numpy,BabeNovelty/numpy,MSeifert04/numpy,utke1/numpy,moreati/numpy,nguyentu1602/numpy,SiccarPoint/numpy,chatcannon/numpy,empeeu/numpy,GrimDerp/numpy,tdsmith/numpy,felipebetancur/numpy,MichaelAquilina/numpy,grlee77/numpy,Dapid/numpy,cjermain/numpy,b-carter/numpy,WarrenWeckesser/numpy,argriffing/numpy,Vi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