Add a bunch of missing entries for glGet*

[NogginBops]

Fixes #41

I also need to add from which version these constants are available from.

Adds:

• GL_DEBUG_LOGGED_MESSAGES
• GL_DEBUG_NEXT_LOGGED_MESSAGE_LENGTH
• GL_MAX_DEBUG_MESSAGE_LENGTH
• GL_MAX_DEBUG_LOGGED_MESSAGES
• GL_QUERY_BUFFER_BINDING
• GL_COPY_READ_BUFFER_BINDING
• GL_COPY_WRITE_BUFFER_BINDING
• GL_RESET_NOTIFICATION_STRATEGY
• GL_TEXTURE_BUFFER_BINDING
• GL_MIN_FRAGMENT_INTERPOLATION_OFFSET
• GL_MAX_FRAGMENT_INTERPOLATION_OFFSET
• GL_FRAGMENT_INTERPOLATION_OFFSET_BITS
• GL_MAX_COLOR_ATTACHMENTS
• GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS
• GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS
• GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS
• GL_MAX_TRANSFORM_FEEDBACK_BUFFERS
• GL_MAX_SAMPLES

TODO (a few I found that are still missing):

• GL_MAX_SUBROUTINES
• GL_MAX_SUBROUTINE_UNIFORM_LOCATIONS
• GL_MAX_ATOMIC_COUNTER_BUFFER_BINDINGS
• GL_MAX_ATOMIC_COUNTER_BUFFER_SIZE
• GL_MAX_SHADER_STORAGE_BLOCK_SIZE
• GL_MAX_IMAGE_UNITS
• GL_MAX_COMBINED_SHADER_OUTPUT_RESOURCES
• GL_MAX_IMAGE_SAMPLES
• GL_MAX_VERTEX_IMAGE_UNIFORMS
• GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS
• GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS
• GL_MAX_GEOMETRY_IMAGE_UNIFORMS
• GL_MAX_FRAGMENT_IMAGE_UNIFORMS
• GL_MAX_COMBINED_IMAGE_UNIFORMS
• GL_POLYGON_OFFSET_CLAMP
• GL_POLYGON_MODE