Remove old Fort Mode from frontend Part of ripping out Fort Mode from game schemes. This time for real. - Remove the game modifier button "Fort Mode" - Remove the scheme "Fort Mode" - Remove some fort mode handling code - Keep gfForts symbol to not mess up things too much - Old schemes are still supported, the fortsmode parameter is just ignored

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void fpcrtl_halt(int num) {

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    __coverity_panic__();

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}

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int fpcrtl_abs(int num) {

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    return num >= 0 ? num : -num;

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}