Improve package dependences

[waruqi]

• add add_requireconfs() to rewrite package/deps configs

for example: https://github.com/xmake-io/xmake/blob/deps/tests/projects/package/depconfigs/xmake.lua

add_requires("libpng", "libtiff", {system = false, configs = {vs_runtime = "MD"}})
add_requires("libwebp")

add_requireconfs("libwebp",            {system = false, configs = {shared = true, vs_runtime = "MD"}})
add_requireconfs("libpng.zlib",        {system = false, configs = {cxflags = "-DTEST1"}, version = "1.2.10"})
add_requireconfs("libtiff.*|cmake",    {system = false, configs = {cxflags = "-DTEST2"}})
add_requireconfs("libwebp.**|cmake",   {system = false, configs = {cxflags = "-DTEST3"}})

pr:
#1175

[waruqi]

and the configs of add_requires have a higher priority than add_requireconfs.

for example:

    -- foo and bar will be debug mode
    add_requireconfs("*", {configs = {debug = false}})
    add_requires("foo", "bar", {configs = {debug = true}})

[waruqi]

we can also override the configs of add_requires

add_requires("zlib 1.2.11")
add_requireconfs("zlib", {override = true, version = "1.2.10"})

we override the version of zlib to 1.2.10