Add a new script to compile resources.

- No more dependency to reswrap binary (everything is done in python)
- Resource strings can be directly accessed.
  As side effect, it add a check at compilation if the resource is
  declared and compiled in the binary.
- The resource content can be overwritten at runtime with a env variable.

There is also few clean in the static as some files shoul be in the tools
directory.

The compile_resource script is install to let other project use it.

static/meson.build

@@ -0,0 +1,7 @@
+
+
+lib_resources = custom_target('resources',
+  input: 'resources_list.txt',
+  output: ['kiwixlib-resources.cpp', 'kiwixlib-resources.h'],
+  command:[res_compiler, '--cxxfile', '@OUTPUT0@', '--hfile', '@OUTPUT1@', '@INPUT@']
+)