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Lots of changes added, check CHANGELOG for detailed description

Replaced ex06b (incomplete) by a new useful one

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The default compiler flags on Ubuntu includes -Wformat -Wformat-security which is what gives this error. That flag is used as a precaution against introducing security related bugs.

Some functions added (collision detection)
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Useful to be used with DrawTextEx() to draw with default font and
extended parameters

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