build: introduce luci-base
Merges libs/core, libs/ipkg, libs/web, libs/sys, libs/sgi-cgi, libs/sgi-uhttpd,
modules/admin-core, themes/base and protcols/core into modules/base and renames
luci-lib-core to luci-base.
- [DH] modules/admin-core/Makefile
- [DH] modules/admin-core/ipkg/postinst
- [DH] modules/admin-core/luasrc/controller/admin/servicectl.lua
- [DH] modules/admin-core/luasrc/tools/status.lua
- [DH] modules/admin-core/luasrc/tools/webadmin.lua
- [DH] modules/admin-core/luasrc/view/error404.htm
- [DH] modules/admin-core/luasrc/view/error500.htm
- [DH] modules/admin-core/luasrc/view/footer.htm
- [DH] modules/admin-core/luasrc/view/header.htm
- [DH] modules/admin-core/luasrc/view/indexer.htm
- [DH] modules/admin-core/luasrc/view/sysauth.htm
- [DH] modules/admin-core/root/etc/init.d/luci_dhcp_migrate
- [DH] modules/admin-core/root/etc/init.d/luci_fixtime
- [DH] modules/admin-core/root/www/index.html