Raw type system support for strings

[Rantanen]

The raw type system uses raw C-strings (null terminated strings with 1-byte characters). This isn't necessarily the final form and is up for debate, but I wanted some sort of support for raw type system strings so we can test the type system infrastructure works.

On the other hand I do feel there is some value in supporting C-strings as well. I wonder if it would make sense to support 3 type systems instead of the current two:

• Automation
• Raw (C-type system)
• Intercom (Length prefixed C-strings for performance reasons)

[codecov-io]

Codecov Report

Merging #85 into master will increase coverage by 0.22%. The diff coverage is 68.84%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   73.82%   74.05%   +0.22%     
==========================================
  Files          55       55              
  Lines        3889     4012     +123     
==========================================
+ Hits         2871     2971     +100     
- Misses       1018     1041      +23

Impacted Files	Coverage Δ
intercom/src/lib.rs	45.45% <ø> (ø)	:arrow_up:
intercom-common/src/generators/cpp.rs	80.98% <100%> (+0.06%)	:arrow_up:
intercom-common/src/generators/idl.rs	82.31% <100%> (+0.06%)	:arrow_up:
intercom/src/strings.rs	68.07% <58.76%> (+0.87%)	:arrow_up:
intercom-common/src/returnhandlers.rs	85.71% <75%> (-0.5%)	:arrow_down:
intercom-common/src/tyhandlers.rs	80.36% <93.1%> (+3.77%)	:arrow_up:
intercom/src/alloc.rs	80.48% <0%> (+14.63%)	:arrow_up:

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