[MonoDevelop] Patch to make project's custom commands more similar to the external tools in the IDE

[Marcos Marín]

In the IDE you can create external tools where you can specify the command,
arguments and the working directory. Additionally you can use variables such
as ${ProjectDir} etc. and there is a nice button to suggest possible
variables.

When you create a custom command for a project you only get to specify the
command and you can't specify the working dir nor use variables. This patch
makes the custom commands similar to the external tools in that you can
specify command, arguments, working dir (defaults to project's base dir) and
you can use variables plus it adds buttons to suggest available variables.

Is it okay to commit?
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