gitweb: Create Gitweb::RepoConfig module

gitweb: Create Gitweb::RepoConfig module

Create a Gitweb::RepoConfig module in 'gitweb/lib/Gitweb/RepoConfig.pm'
to store and handle all the configuration and subroutines
related to a single repository regarding the gitweb.perl script.

This module depend on several other modules like Git.pm,
Config.pm, Request.pm and Escape.pm.

It also include subroutines regarding project_list and
it's handling.

Subroutines moved:
	check_head_link
	check_export_ok
	hash_set_multi
	git_parse_project_config
	config_to_bool
	config_to_int
	config_to_multi
	feature_bool
	feature_snapshot
	feature_patches
	feature_avatar
	git_get_project_config
	git_get_project_description
	git_get_project_ctags
	git_populate_project_tagcloud
	git_show_project_tagcloud
	git_get_project_url_list
	git_get_projects_list
	git_get_project_list_from_file
	git_get_project_owner
	get_file_owner
	project_in_list

Update gitweb/Makefile to install Gitweb::RepoConfig module
alongside gitweb

Signed-off-by: Pavan Kumar Sunkara <pavan.sss1991@gmail.com>