API: Allow cross-origin requests
API: Allow cross-origin requests

When a REST API is called from within a browser page from a different domain,
the server needs to explicitly allow this. This makes the OctoPrint
API available also to other webapps, for instance those hosted on same network in hackerspace.

leductan-nguyen/RaionPi,SeveQ/OctoPrint,abinashk-inf/AstroBox,mayoff/OctoPrint,eliasbakken/OctoPrint,ryanneufeld/OctoPrint,jneves/OctoPrint,MoonshineSG/OctoPrint,Jaesin/OctoPrint,jneves/OctoPrint,uuv/OctoPrint,nicanor-romero/OctoPrint,madhuni/AstroBox,MoonshineSG/OctoPrint,spapadim/OctoPrint,MoonshineSG/OctoPrint,bicephale/OctoPrint,beeverycreative/BEEweb,Skeen/OctoPrint,eddieparker/OctoPrint,bicephale/OctoPrint,shaggythesheep/OctoPrint,Voxel8/OctoPrint,Salandora/OctoPrint,CapnBry/OctoPrint,punkkeks/OctoPrint,ryanneufeld/OctoPrint,dragondgold/OctoPrint,mcanes/OctoPrint,JackGavin13/octoprint-test-not-finished,JackGavin13/octoprint-test-not-finished,senttech/OctoPrint,chriskoz/OctoPrint,shaggythesheep/OctoPrint,Javierma/OctoPrint-TFG,JackGavin13/octoprint-test-not-finished,nickverschoor/OctoPrint,shohei/Octoprint,bicephale/OctoPrint,uuv/OctoPrint,foosel/OctoPrint,mrbeam/OctoPrint,Jaesin/OctoPrint,Salandora/OctoPrint,AstroPrint/AstroBox,shohei/Octoprint,EZ3-India/EZ-Remote,beeverycreative/BEEweb,JackGavin13/octoprint-test-not-finished,eddieparker/OctoPrint,mcanes/OctoPrint,Javierma/OctoPrint-TFG,SeveQ/OctoPrint,eddieparker/OctoPrint,leductan-nguyen/RaionPi,Voxel8/OctoPrint,nicanor-romero/OctoPrint,spapadim/OctoPrint,Mikk36/OctoPrint,dragondgold/OctoPrint,Javierma/OctoPrint-TFG,Salandora/OctoPrint,MaxOLydian/OctoPrint,MaxOLydian/OctoPrint,masterhou/OctoPrint,ErikDeBruijn/OctoPrint,punkkeks/OctoPrint,abinashk-inf/AstroBox,markwal/OctoPrint,sstocker46/OctoPrint,ryanneufeld/OctoPrint,beeverycreative/BEEweb,dansantee/OctoPrint,ymilord/OctoPrint-MrBeam,alex1818/OctoPrint,Voxel8/OctoPrint,beeverycreative/BEEweb,CapnBry/OctoPrint,AstroPrint/AstroBox,mcanes/OctoPrint,madhuni/AstroBox,markwal/OctoPrint,sstocker46/OctoPrint,javivi001/OctoPrint,leductan-nguyen/RaionPi,markwal/OctoPrint,ymilord/OctoPrint-MrBeam,Salandora/OctoPrint,abinashk-inf/AstroBox,masterhou/OctoPrint,shaggythesheep/OctoPrint,ymilord/OctoPrint-MrBeam,leductan-nguyen/RaionPi,dragondgold/OctoPrint,jneves/OctoPrint,AstroPrint/AstroBox,MoonshineSG/OctoPrint,foosel/OctoPrint,nickverschoor/OctoPrint,ymilord/OctoPrint-MrBeam,Javierma/OctoPrint-TFG,ymilord/OctoPrint-MrBeam,foosel/OctoPrint,sstocker46/OctoPrint,shohei/Octoprint,CapnBry/OctoPrint,Skeen/OctoPrint,ryanneufeld/OctoPrint,uuv/OctoPrint,Skeen/OctoPrint,Mikk36/OctoPrint,Mikk36/OctoPrint,shohei/Octoprint,madhuni/AstroBox,mrbeam/OctoPrint,senttech/OctoPrint,mayoff/OctoPrint,mrbeam/OctoPrint,eliasbakken/OctoPrint,senttech/OctoPrint,EZ3-India/EZ-Remote,EZ3-India/EZ-Remote,ErikDeBruijn/OctoPrint,nicanor-romero/OctoPrint,dansantee/OctoPrint,MaxOLydian/OctoPrint,masterhou/OctoPrint,nickverschoor/OctoPrint,ErikDeBruijn/OctoPrint,mayoff/OctoPrint,bicephale/OctoPrint,dansantee/OctoPrint,madhuni/AstroBox,EZ3-India/EZ-Remote,spapadim/OctoPrint,javivi001/OctoPrint,alex1818/OctoPrint,nickverschoor/OctoPrint,Jaesin/OctoPrint,Jaesin/OctoPrint,shohei/Octoprint,SeveQ/OctoPrint,punkkeks/OctoPrint,CapnBry/OctoPrint,chriskoz/OctoPrint,foosel/OctoPrint,eliasbakken/OctoPrint,senttech/OctoPrint,chriskoz/OctoPrint,abinashk-inf/AstroBox,javivi001/OctoPrint,chriskoz/OctoPrint,alex1818/OctoPrint