ShaderProgram: Add glUniform for single value calls using non-v variants

[hugoam]

After discussion in this issue: #591
Here is a draft of adding the setUniform calls mapping to non-v variants of glUniform functions :)

[mosra]

So it was 16 variants after all, not 12 :) Thanks! I'll merge it ASAP, there isn't much else to do here.

[codecov]

Codecov Report

Merging #592 (6ba47d4) into master (eb382b3) will decrease coverage by 1.81%.
The diff coverage is 21.92%.

@@            Coverage Diff             @@
##           master     #592      +/-   ##
==========================================
- Coverage   82.20%   80.38%   -1.82%     
==========================================
  Files         525      530       +5     
  Lines       36417    40738    +4321     
==========================================
+ Hits        29936    32748    +2812     
- Misses       6481     7990    +1509     

Impacted Files	Coverage Δ
src/Magnum/GL/AbstractShaderProgram.cpp	26.02% <19.78%> (-14.97%)	⬇️
...rc/Magnum/GL/Implementation/ShaderProgramState.cpp	23.28% <27.27%> (-4.08%)	⬇️
src/Magnum/GL/AbstractShaderProgram.h	58.53% <100.00%> (-14.44%)	⬇️
src/Magnum/GL/Shader.h	40.74% <0.00%> (-50.17%)	⬇️
src/Magnum/GL/AbstractObject.h	50.00% <0.00%> (-50.00%)	⬇️
src/Magnum/Shaders/VectorGL.cpp	56.87% <0.00%> (-26.34%)	⬇️
src/Magnum/Shaders/PhongGL.cpp	55.08% <0.00%> (-24.58%)	⬇️
src/Magnum/GL/Implementation/ShaderState.cpp	52.63% <0.00%> (-24.30%)	⬇️
src/Magnum/Shaders/VertexColorGL.cpp	55.65% <0.00%> (-24.08%)	⬇️
src/Magnum/Shaders/FlatGL.cpp	62.66% <0.00%> (-23.53%)	⬇️
... and 53 more

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[mosra]

Wow, the codecov reports are utter garbage. What is going on in there.

[mosra]

Merged as 40d1326 (I did a rebase against latest master), thank you!