Add idea: Support for "granularity builds"

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+? Support for "granularity builds" [idea]
+
+In some projects the shared libraries get so large that it takes very long to
+link even for small changes (e.g., a single object file changed). What some do
+is split the library into multiple ones for debug builds (they still build and
+link a single one for release). As a result, when a single file gets changed
+then only one, smaller library need to be relinked. This is called
+"granularity builds" (as in fine and coarse).
+
+Note that this is not the same as utility libraries (multiple static libraries
+that at the end get assembled into a single shared library).