* Make the library modular usable.
* Switch to library requirements instead of source. As source puts extra source in install targets.
* Add wave tool build to all target.
* Add missing NO_LIB usage requirements.
* Add requires-b2 check to top-level build file.
* Bump B2 require to 5.2
* Change all <source> references to <library>.
* Move inter-lib dependencies to a project variable and into the build targets.
* Update build deps.
These changes, a subset of what clang-format generates, ensure code
and comments are aligned properly for the level of the code. There
were a number of places where comments (many) and code (some) were
four spaces to the left of where they should be. This will make the
code easier to read.
One advantage of separating out these changes is they can be verified
to be whitespace-only with a simple diff.
Support was already in slex, though it wasn't covered by the token
test. This updates the tests while adding virtually identical code
to lexertl and xlex.
Reduce build time by:
- using iosfwd instead of iostream, where possible
- where iostream is necessary but only used for debugging,
making its inclusion conditional
- removing old C-style headers
I used IWYU to guide this work
