ImmModeSink: Fix bugs (use glBufferUsage, vboUsage, GL_POLYGON, GL_QUADS) and add API docs. (API Change)

- Changed create*(..) factory methods (API Change)
  - Drop passing GL instance, not needed
    - allows creation of ImmModeSink as final field w/o GL context
  - Use 'glBufferUsage' to determine whether to use VBO or not ( 0 == glBufferUsage )

- Use glBufferUsage in glBufferData(..) call (oops)

- Toggle vboUsage per object ( 0 == glBufferUsage ? nonVBO : VBO )
  remove static VBO usage flag

- Fix render mode
  - GL_POLYGON -> GL_TRIANGLE_FAN (not GL_LINES)
  - GL_QUADS -> Looped GL_TRIANGLE_FAN (is !GL2) in draw(..) w/ and w/o indices

- Buffer usage

  - documented

  - allow creating sink w/ all components (vertices, color, normal and texCoords)
    bit render and grow only used parts.
    This allows proper usage of sink where it is not known
    which types are being used.

- Added test case

- Manually tested w/ Jake2 ES1
  Jake2 uses the FFP immediate mode rendering, where we utilize this sink
  w/o rendering artifacts.

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