Init, adding corrade,magnum,magnum-plugins,magnum-integration,magnum-extras, and magnum-examples 2025.47_1

common/build-style/README

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+BUILD STYLES
+============
+
+These shell snippets provide support for multiple build systems, i.e GNU configure,
+CMake, etc. A build style file must provide at least the following functions:
+
+	- do_configure
+	- do_build
+	- do_install
+
+If a source package defines its own do_xxx() function, the function defined in
+the build style file is simply ignored.