Doxygen: Rm blank lines/replace leading tab.

vim/scripts/DoxygenUtility/autoload/DoxygenUtility.vim
	-Replacing comment blocks' lines' leading hard-tab with a " *".
	-Remove blank lines from comment blocks.
Further minor Doxygen improvements/changes.

vim/scripts/DoxygenUtility/autoload/DoxygenUtility.vim
	-Change the opening and closing comment delimiters from `/*` and
	`*/` to `/**` and ` */` respectively; a style preference more
	than anything else.
	-Strip all dereferencing operators from argument `@param`
	strings.
Merge branch 'feature/doxygen_utility' into develop

vim/scripts/DoxygenUtility/autoload/DoxygenUtility.vim
	-Apply minor changes and improvements to the Vim DoxygenUtility
	plugin.