#123 plugin system/battle chip gate support

[chpatrick]

If VBA had a plugin system, developers could add
support for more obscure systems like the MMBN 4.5
Battle Chip Gate without having to insert it into the
code and the end users having many versions of modified
VBAs which are essentially the same thing but differ in
some manner.

[Forgotten]

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An easy way to avoid the problem is to contribute the code
back, that's why it is called open source.