Add implementation for ws_value_object_id to string
Merge pull request #588 from matthiasbeyer/add-objid_tostr

Add implementation for ws_value_object_id to string
Add module for finding GLES2
Add requirement for GLES2 to global CMakeLists.txt
Use GLES2 in utils
Add basic format and query function
Use new format in buffers
Add function for ading the formats
Only allow selected formats for shared memory buffers
Merge pull request #605 from neithernut/add-util-format

Add basic format and query function
Add definition of texture
Add method for binding a texture
Add method for updating a texture
Use surface geometry, do not care about some buffer
Add texture to surface, mark image buffer for removal