Create a real module kiwixbuild and make it installable. Split files.

Make kiwix-build installable using pip.
Module is now called `kiwixbuild` because `kiwix-build` is not a valid
python identifier.

Also split toolchains in separated directory.

kiwixbuild/dependency_versions.py

@@ -0,0 +1,28 @@
+
+main_project_versions = {
+    'kiwix-lib': '1.1.0',
+    'kiwix-tools': '0.4.0',
+    'libzim': '3.2.0',
+    'zim-tools': '0.0.1',
+    'zimwriterfs': '1.1',
+}
+
+
+# This is the "version" of the whole base_deps_versions dict.
+# Change this when you change base_deps_versions.
+base_deps_meta_version = '1'
+
+
+base_deps_versions = {
+  'zlib' : '1.2.8',
+  'lzma' : '5.2.3',
+  'uuid' : '1.43.4',
+  'xapian-core' : '1.4.5',
+  'ctpp2' : '2.8.3',
+  'pugixml' : '1.2',
+  'libmicrohttpd' : '0.9.46',
+  'gumbo' : '0.10.1',
+  'icu4c' : '58.2',
+  'Gradle' : '3.4',
+  'libaria2' : '1.33.1'
+}