Freestanding support

[cschreib]

This PR implements changes to improve support for freestanding platforms, see #189:

• [API] Fixed inplace_any does not move correctly #207: inplace_any move constructor was not moving the inner object correctly.
• [API] Added file output customization points snitch::io::file_open, file_write, and file_close.
• [Build] Added SNITCH_MAX_FILE_OBJECT_SIZE_BYTES to specify the maximum size of a file object (the object used to open/write to a file, not the size of the file itself).
• [Build] Added SNITCH_WITH_STDOUT to enable/disable the default console implementation with stdout.
• [Build] Added SNITCH_WITH_STD_FILE_IO to enable/disable the default file output implementation with <cstdio>.
• [Internal] Remove explicit calls to std::memmove and std::memcpy.

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 93.97%. Comparing base (cec4a04) to head (4bcf4d2).

Files with missing lines	Patch %	Lines
src/snitch_file.cpp	83.33%	4 Missing ⚠️
include/snitch/snitch_any.hpp	96.87%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #208      +/-   ##
==========================================
- Coverage   94.01%   93.97%   -0.05%     
==========================================
  Files          30       30              
  Lines        1754     1775      +21     
==========================================
+ Hits         1649     1668      +19     
- Misses        105      107       +2     

Files with missing lines	Coverage Δ
include/snitch/snitch_function.hpp	100.00% <ø> (ø)
src/snitch_append.cpp	94.11% <100.00%> (ø)
src/snitch_console.cpp	100.00% <ø> (ø)
src/snitch_string_utility.cpp	100.00% <100.00%> (ø)
include/snitch/snitch_any.hpp	97.72% <96.87%> (-2.28%)	⬇️
src/snitch_file.cpp	75.75% <83.33%> (+5.16%)	⬆️

... and 1 file with indirect coverage changes

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