fixes meson build warnings

[Jules-L]

Description

I use cwalk as a subproject and I kept getting 2 warnings from Meson in my top level project:

• include_directories is a newer feature than the min supported meson version (>=0.45.1): meson.build:15: WARNING: Project targets '>= 0.45.1' but uses feature introduced in '0.50.0': include_directories kwarg of type string. Use include_directories('include') instead
• No project version specified in call to project()

Changes

• moves version string to file.
• bumps meson version to >=0.57.0.
• adds version to meson project call.

How Has This Been Tested?

Built from source using both meson and CMake: -meson setup meson_build && meson compile -C meson_build -mkdir cmake_build && cd cmake_build && cmake .. && make

Seemed to work fine for both. Ran the test suite successfully on the cmake_build.

[codecov[bot]]

Codecov Report

Merging #35 (afaf691) into master (d92d846) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #35   +/-   ##
=======================================
  Coverage   98.00%   98.00%           
=======================================
  Files           1        1           
  Lines         502      502           
=======================================
  Hits          492      492           
  Misses         10       10           

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[likle]

Hi @Jules-L , thank you so much for your pull requests! It is really appreciated.

I wasn't entirely sure about the separate version file as I haven't seen this method widely spread. But pragmatically it makes sense and I haven't seen any issues so far, so I will merge this and we will see how it goes 🙂