configure: Add --enable-minify-css arg

Issue #18.
configure: Add --enable-minify-js arg

Issue #18.
configure: Add --enable-minify-html arg

Issue #18.
configure: Add minification summary to features sec

Issue #18.
build: Enable optional minification of CSS

Issue #18.
build: Enable optional minification of JS

Issue #18.
build: Enable optional minification of HTML

Issue #18.
build: Indent compile defines

Issue #18.