Allow for access to imageData on L.ImageOverlay
Allow for access to imageData on L.ImageOverlay

This implements the changes in https://github.com/Leaflet/Leaflet/pull/2621 for cross origin tiles for `L.ImageOverlay` so that the image data can be accessed in canvas and saved.

w8r/Leaflet,iZucken/Leaflet,msokk/Leaflet,brah/Leaflet,wancharle/Leaflet,Fil/Leaflet,frogcat/Leaflet,snkashis/Leaflet,mediasuitenz/Leaflet,pakro/Leaflet,tsantacruz/RotationalMarker,billybonz1/Leaflet,wrrnwng/Leaflet,elfalem/Leaflet,scaddenp/Leaflet,sambernet/Leaflet,akauppi/Leaflet,RyanHickman/Leaflet,msiadak/Leaflet,Ossehoht/Leaflet,bolshoibooze/Leaflet,thalesfsp/Leaflet,jblarsen/Leaflet,nathancahill/Leaflet,fab1an/Leaflet,davojta/Leaflet,akauppi/Leaflet,MuellerMatthew/Leaflet,Ubisense/Leaflet,AndBicScadMedia/Leaflet,javimolla/Leaflet,tormi/Leaflet,davidlukerice/Leaflet,bolshoibooze/Leaflet,RobertoMalatesta/Leaflet,iZucken/Leaflet,jmutua2015/Leaflet,tormi/Leaflet,codeator/Leaflet,thalesfsp/Leaflet,iOffice/Leaflet,kjell/Leaflet,iOffice/Leaflet,CapeSepias/Leaflet,brah/Leaflet,cartant/Leaflet,sisou/Leaflet,wrrnwng/Leaflet,w8r/Leaflet,mbrukman/Leaflet,eriksjaastad/Leaflet,Neorth/Leaflet,prashen/Leaflet,jasonoverland/Leaflet,tsantacruz/RotationalMarker,nathancahill/Leaflet,grahamthompson/Leaflet,jasonoverland/Leaflet,bbecquet/Leaflet,msiadak/Leaflet,MuellerMatthew/Leaflet,devjoseluis/Leaflet,twoubt/Leaflet,prashen/Leaflet,Andrey-Pavlov/Leaflet,jblarsen/Leaflet,huangsong/Leaflet,Leaflet/Leaflet,hyperknot/Leaflet,cmulders/Leaflet,tormi/Leaflet,caiiiycuk/Leaflet,geoloep/Leaflet,dhootha/Leaflet,olafurr/Leaflet,tbassett44/Leaflet,alex2wong/Leaflet,klaftertief/Leaflet,nikhildhamsaniya/Leaflet,caiiiycuk/Leaflet,Srikanth4/Leaflet,nycitt/Leaflet,klaftertief/Leaflet,billybonz1/Leaflet,thalesfsp/Leaflet,sellonen/Leaflet,mediasuitenz/Leaflet,olafurr/Leaflet,psicomante/Leaflet,alex2wong/Leaflet,mstahv/Leaflet,sellonen/Leaflet,dhootha/Leaflet,Trufi/Leaflet,mediasuitenz/Leaflet,Trufi/Leaflet,elkingtonmcb/Leaflet,dhootha/Leaflet,webmechanicx/Leaflet,RyanHickman/Leaflet,RyanHickman/Leaflet,taraszerebecki/Leaflet,Trufi/Leaflet,andrewmartini/Leaflet,billybonz1/Leaflet,starsolaris/Leaflet,kjell/Leaflet,geoloep/Leaflet,beni55/Leaflet,elkingtonmcb/Leaflet,pzdz/Leaflet,pzdz/Leaflet,olafurr/Leaflet,w8r/Leaflet,davidlukerice/Leaflet,beni55/Leaflet,iZucken/Leaflet,Srikanth4/Leaflet,akrzyzanowskino/TeamSE,tomnod/Leaflet,nycitt/Leaflet,nathancahill/Leaflet,javimolla/Leaflet,pakro/Leaflet,waeltken/Leaflet,nycitt/Leaflet,jasonoverland/Leaflet,andrewmartini/Leaflet,hyperknot/Leaflet,caiiiycuk/Leaflet,pakro/Leaflet,kumy/Leaflet,tomnod/Leaflet,jblarsen/Leaflet,Neorth/Leaflet,litnerdy/Leaflet,waeltken/Leaflet,elfalem/Leaflet,bbecquet/Leaflet,beni55/Leaflet,jmutua2015/Leaflet,iamjonbradley/Leaflet,Ubisense/Leaflet,waeltken/Leaflet,wpf500/Leaflet,huangsong/Leaflet,davojta/Leaflet,jmutua2015/Leaflet,wancharle/Leaflet,sellonen/Leaflet,alex2wong/Leaflet,Srikanth4/Leaflet,davojta/Leaflet,Andrey-Pavlov/Leaflet,cmulders/Leaflet,pzdz/Leaflet,bolshoibooze/Leaflet,Ossehoht/Leaflet,scaddenp/Leaflet,sambernet/Leaflet,devjoseluis/Leaflet,webmechanicx/Leaflet,elfalem/Leaflet,tomnod/Leaflet,stefanocudini/Leaflet,akrzyzanowskino/TeamSE,starsolaris/Leaflet,RobertoMalatesta/Leaflet,cartant/Leaflet,taraszerebecki/Leaflet,twoubt/Leaflet,twoubt/Leaflet,sambernet/Leaflet,tsantacruz/RotationalMarker,frogcat/Leaflet,cartant/Leaflet,elkingtonmcb/Leaflet,msiadak/Leaflet,eriksjaastad/Leaflet,Andrey-Pavlov/Leaflet,Fil/Leaflet,CapeSepias/Leaflet,andrewmartini/Leaflet,snkashis/Leaflet,RobertoMalatesta/Leaflet,devjoseluis/Leaflet,scaddenp/Leaflet,iOffice/Leaflet,grahamthompson/Leaflet,javimolla/Leaflet,CorainChicago/Leaflet,rlugojr/Leaflet,iamjonbradley/Leaflet,Ubisense/Leaflet,webmechanicx/Leaflet,wancharle/Leaflet,iamjonbradley/Leaflet,2gis/Leaflet,sisou/Leaflet,eriksjaastad/Leaflet,msokk/Leaflet,Ossehoht/Leaflet,psicomante/Leaflet,tbassett44/Leaflet,nikhildhamsaniya/Leaflet,akrzyzanowskino/TeamSE,CorainChicago/Leaflet,msokk/Leaflet,mstahv/Leaflet,2gis/Leaflet,fab1an/Leaflet,AP-whitehat/Leaflet,litnerdy/Leaflet,kumy/Leaflet,MuellerMatthew/Leaflet,wrrnwng/Leaflet,nikhildhamsaniya/Leaflet,AndBicScadMedia/Leaflet,kumy/Leaflet,CorainChicago/Leaflet,rlugojr/Leaflet,Fil/Leaflet,wpf500/Leaflet,AndBicScadMedia/Leaflet,taraszerebecki/Leaflet,grahamthompson/Leaflet,bbecquet/Leaflet,psicomante/Leaflet,frogcat/Leaflet,mbrukman/Leaflet,AP-whitehat/Leaflet,CapeSepias/Leaflet,litnerdy/Leaflet,davidlukerice/Leaflet,wpf500/Leaflet,fab1an/Leaflet,mbrukman/Leaflet,mstahv/Leaflet,geoloep/Leaflet,hyperknot/Leaflet,stefanocudini/Leaflet,klaftertief/Leaflet,Leaflet/Leaflet,cmulders/Leaflet,akauppi/Leaflet,rlugojr/Leaflet,2gis/Leaflet,Neorth/Leaflet,starsolaris/Leaflet,fredericksilva/Leaflet,fredericksilva/Leaflet,huangsong/Leaflet,codeator/Leaflet,codeator/Leaflet,Leaflet/Leaflet,brah/Leaflet,stefanocudini/Leaflet,tbassett44/Leaflet,snkashis/Leaflet,fredericksilva/Leaflet,sisou/Leaflet,prashen/Leaflet,AP-whitehat/Leaflet