map_draw_backdrop
indentation
If pass 0 to BatchBegin(), auto_realloc will be enabled.

It means, that now max_size in BatchBegin() is only a hint.
sprites can be drawn in batch
Statusbar sprites are drawn in batches
DrawBatchAddPatternAcross
More optimizations
Allow batch draws on texture
Minimap rendered with normal speed

Fixes #8
Fixed #32

There was unsynchronized access in main thread and sound device thread. final_buffer was freed in main thread without locking, so sound thread crashed on access.
Merge branch 'fix_32_crash_on_music_change' into batch_render_gles
Fade In, Fade Out render speed up