Add a DEBUG_PRINT() macro

[jeromehue]

Description

Adds DEBUG_PRINT(), a macro that prints stuff via RODOS::PRINTF() if DEBUG is defined. Otherwise, it does nothing.

The test for DispatchCommand() is removed because it was a golden test that relied on the function actually printing what it does, which is not something the "real" DispatchCommand() would do. Also, the whole command parsing and handling has to be reworked anyway once we start implementing the real protocol that we will use in space.

Fixes #43

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.54%. Comparing base (c8e128f) to head (7944925).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #234      +/-   ##
==========================================
+ Coverage   88.36%   96.54%   +8.17%     
==========================================
  Files          20       14       -6     
  Lines         576      434     -142     
==========================================
- Hits          509      419      -90     
+ Misses         67       15      -52     

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