MatXX -> MatX, Vec3() &co inits, GLSL de-#included

- ozCore
  * Vec3, Vec4, Quat, Point, Plane initialise all members in default ctor
  * Mat33 -> Mat3
  * Mat44 -> Mat4
  * JSON
    + get() functions have default parameters
    + internal JSON::Parser(::Position) class flattened
- glsl
  * all shaders use one file only (no #includes) to avoid errors in QtCreator
    and redundant uniforms
  * shader json files format changed