Build: Add a separate config file and library/binary search paths support

Former-commit-id: f875de03150e6c505816bf526bc0432c9fffccac [formerly 52eef94d32a8b41b1381cfc63fcb5eb1e058f2b9]
Former-commit-id: 22da03a49982c4f48a1feb6cf7319b07949ad295

build/config.lua

@@ -0,0 +1,17 @@
+-- This file contains special configurations values, such as directories to extern libraries (Qt)
+-- Editing this file is not required to use/compile the engine, as default values should be enough
+
+-- Builds Nazara extern libraries (such as lua/STB)
+BuildDependencies = true
+
+-- Builds Nazara examples
+BuildExamples = true
+
+-- Setup additionnals install directories, separated by a semi-colon ; (library binaries will be copied there)
+--InstallDir = "/usr/local/lib64"
+
+-- Excludes client-only modules/tools/examples
+ServerMode = false
+
+-- Builds modules as one united library (useless on POSIX systems)
+UniteModules = false