Merge branch 'ps/config-wo-the-repository'

The config API had a set of convenience wrapper functions that implicitly use the_repository instance; they have been removed and inlined at the calling sites. * ps/config-wo-the-repository: (21 commits) config: fix sign comparison warnings config: move Git config parsing into "environment.c" config: remove unused `the_repository` wrappers config: drop `git_config_set_multivar()` wrapper config: drop `git_config_get_multivar_gently()` wrapper config: drop `git_config_set_multivar_in_file_gently()` wrapper config: drop `git_config_set_in_file_gently()` wrapper config: drop `git_config_set()` wrapper config: drop `git_config_set_gently()` wrapper config: drop `git_config_set_in_file()` wrapper config: drop `git_config_get_bool()` wrapper config: drop `git_config_get_ulong()` wrapper config: drop `git_config_get_int()` wrapper config: drop `git_config_get_string()` wrapper config: drop `git_config_get_string()` wrapper config: drop `git_config_get_string_multi()` wrapper config: drop `git_config_get_value()` wrapper config: drop `git_config_get_value()` wrapper config: drop `git_config_get()` wrapper config: drop `git_config_clear()` wrapper ...