Added methods to retrieve single plugin/theme (remote or local) and all updatables. Updatable items have now `version` defaulting to the local installed version and `available` as the remote version
Added methods to retrieve single plugin/theme (remote or local) and all updatables.
Updatable items have now `version` defaulting to the local installed version and `available` as the remote version

tomzx/blog.tomrochette.com,JamesPan/gravbox,tomzx/blog.tomrochette.com,dimayakovlev/grav,tomzx/blog.tomrochette.com,iMoonThailand/grav,joeyhenricks/a-broke-vegan,jinxboy13/grav,tomzx/blog.tomrochette.com,anapsix/dynamicinfradays,Pumpapa/jacinthawalters.nl,notklaatu/grav,VillainyStudios/grav,userfrosting/learn,toovy/grav,Sommerregen/grav,anapsix/dynamicinfradays,notklaatu/grav,JamesPan/gravbox,attiks/grav,qbi/datenknoten.me,qbi/datenknoten.me,frlan/datenknoten.me,frlan/datenknoten.me,JamesPan/gravbox,anapsix/dynamicinfradays,sylvestrelucia/grav,anapsix/dynamicinfradays,Silwereth/grav,userfrosting/learn,enko/datenknoten.me,webuxr/iamrs,Pumpapa/lucaswalters.nl,enko/datenknoten.me,lennerd/grav,getgrav/grav,HarcourtsAcademy/grav-ha,frlan/datenknoten.me,stell/grav,sylvestrelucia/grav,mikkeschiren/sekvenser-grav,jeremykenedy/grav,qbi/datenknoten.me,ccardinaux/grav-test,undesign/undesign.github.io,z3cka/grav,Pumpapa/lucaswalters.nl,userfrosting/learn,Pumpapa/lucaswalters.nl,TheHiddenHaku/alessiobottiroli-website-grav,dimayakovlev/grav,nunull/grav,davistech/grav,getgrav/grav,Vivalldi/grav,Vivalldi/grav,sylvestrelucia/grav,joeyhenricks/a-broke-vegan,chkir/grav,toovy/grav,DonLiborio/grav,JamesPan/gravbox,enko/datenknoten.me,jeffam/grav,frlan/datenknoten.me,qbi/datenknoten.me,userfrosting/learn,tcsizmadia/grav,shortsofia/testesitegrav.github.io,sylvestrelucia/grav,undesign/undesign.github.io,Pumpapa/chriswalters.nl,eivantsov/grav-blog-site,beacloudgenius/grav,enko/datenknoten.me,gigago/grav