Detect C++ source and header extensions beyond .cpp

[sabbaticas]

Closes #43.

Summary

• .cc, .cxx and .c++ now report as C++.
• .hpp, .hh, .hxx and .h++ now report as C++ Header, a new language paralleling C Header.
• .h is unchanged and still reports C Header.

Only .cpp was mapped before, so a codebase using .cc and .hpp showed no C++ at all.

Before and after

File	Before	After
file.cc, file.cxx, file.c++	Unknown	C++
file.hpp, file.hh, file.hxx, file.h++	Unknown	C++ Header
file.cpp	C++	C++
file.h	C Header	C Header

Source

All seven are in the GCC documentation's list of C++ suffixes.

Design notes

• C++ Header is a new language name. Headers are reported separately from sources because that is what panopticas already does for C. Reporting them as plain C++ was considered and rejected as inconsistent with .h.
• .h is not resolved here. It is shared by C, C++ and Objective-C; that is the subject of Proposal: disambiguate .m (Objective-C, MATLAB) and .h (C, C++, Objective-C) #40.
• .C and .H are not mapped. GCC treats the capitalised forms as C++, but panopticas lowercases extensions before lookup, so they still report as C and C Header.
• The changes note has a table of every C++ suffix considered and left unmapped, with the reason for each.

Things to note

• Additive only: no existing mapping changes, so kospex is unaffected until a re-sync.
• Vocabulary is now 89 filetypes and 34 languages; tags are unchanged at 123. The docs site counts are updated to match.
• The version stays at 0.0.21, which is unreleased.

Testing

• pytest: 757 passed. The new tests were written first and failed before the change; one asserts .h still reports C Header.
• A fixture for each of the seven extensions is added in src/tests/; panopticas assess shows each with the expected filetype.

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