Add initial member functionality and cleanup wrapper signatures

[grovesNL]

• Add initial member reflection for Is there a way to inspect uniforms (e.g. sizes, strides, offsets) within a uniform buffer? #43
• Trivial cleanup for wrapper signatures

[codecov]

Codecov Report

Merging #44 into master will increase coverage by 2.39%.
The diff coverage is 94.84%.

@@            Coverage Diff            @@
##           master     #44      +/-   ##
=========================================
+ Coverage   80.41%   82.8%   +2.39%     
=========================================
  Files           5       6       +1     
  Lines         628     762     +134     
=========================================
+ Hits          505     631     +126     
- Misses        123     131       +8

Impacted Files	Coverage Δ
spirv_cross/src/compiler.rs	80.5% <94.73%> (+4.83%)	⬆️
spirv_cross/src/spirv.rs	78.29% <95.23%> (+5.17%)	⬆️
spirv_cross/src/lib.rs	100% <0%> (ø)
spirv_cross/src/glsl.rs	88.05% <0%> (+0.18%)	⬆️
spirv_cross/src/msl.rs	89.34% <0%> (+0.91%)	⬆️

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[grovesNL]

Published 0.4.4