pimgen: Add new Mako templates

Add three new templates in preparation for another round of refactoring.

argument - For rendering array arguments.
method - For rendering method calls.
signature - Fo

pimgen: Add new Mako templates

Add three new templates in preparation for another round of refactoring.

argument - For rendering array arguments.
method - For rendering method calls.
signature - For rendering dbus signature arguments.

Change-Id: I9f9806bcb5c1e048aa283e76f9c6f0f8a7bb53ac
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>

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