README: Update

Update link from i9100/P thread to main development thread on XDA.
update for SAMSUNG GT-I8262
new devices
fix MTK C flags could not be correctly passed
no need to mount twice
formatting
fix compiling for Advanced Edition
const correctness
libtouch_gui 1.08
try to fix random crash on some devices during md5 checks
6.21.9
add Xperia S
libtouch_gui meaningless update
6.22.1: properly fix the md5 check crash
fix compiling of Advanced Edition
Support Golden and Skomer
libtouch_gui 1.09 (cosmetics)
fb2png 2.0.0 by @McKael and @PhilZ-cwm6
enable screen capture by default
Update 6.22.5