Increase scrollrate depending on fontsize
Scroll on mousewheel
Allow scrolling and marking text on non writable textareas
Update lua api about readonly mode
Show scrollbar if text overflows
* Revert 1469424075affce7c27bb44e5a5cbd51485e44b2 and fix wrong char position when doing mouse selection on intlGUIEditBox
position should look at current line not the whole text and shift 1 character on the last line (due to \0 string delimiter)
* Finish the fix and prevent values under zero for getCursorPos which crash the program if found
* Forget to remove old comment
* fix zero to NULL
* Fix typo
The source used a hodge-podge of different combinations of different
macros to check for linux: 'linux', '__linux', '__linux__'.
As '__linux__' is standard (Posix), and the others are not, the source
now uniformly uses __linux__. If either linux or __linux are defined,
it is made sure that __linux__ is defined as well.
