Improve keyboard management in FB device. Thanks to @glemercier for patch.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4776 dfc29bdd-3216-0410-991c-e03cc46cb475
Added OGLES2 support for FB device. Thanks to @glemercier for patch.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4777 dfc29bdd-3216-0410-991c-e03cc46cb475
Fix bug in IGUISkin serialization which messed up serialization of the button-pressed offsets (Thanks at @Midnight for reporting).


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4778 dfc29bdd-3216-0410-991c-e03cc46cb475
Merge branch releases/1.8 revisions 4773 to 4778 into trunk:
- Fix bug in IGUISkin serialization which messed up serialization of the button-pressed offsets (Thanks at @Midnight for reporting).


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4779 dfc29bdd-3216-0410-991c-e03cc46cb475
Example 22 no longer select a random texture after loading a new texture (thanks at mongoose7 for reporting).


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4780 dfc29bdd-3216-0410-991c-e03cc46cb475
Merge branch releases/1.8 revisions 4779 to 4780 into trunk:
- Example 22 no longer select a random texture after loading a new texture (thanks at mongoose7 for reporting).


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4781 dfc29bdd-3216-0410-991c-e03cc46cb475