Coding style is inconsistent

[Joseba Echevarria García]

BennuGD source code seems to follow Allman style while I prefer something more in the line of 1TBS.

This results in different source code files using different conventions, which is far from ideal.

PixTudio could define a .clang-format file with the project's canonical style so that the whole source code followed the same style.

The whole source code should then be formatted to that style.

[Joseba Echevarria García]

Fix #13, some more manual tunning should be required yet

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