Improve switch handling of brackets and integer/long #216
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This fixes the handling of brackets around switch then literals, the parser has supported these for a while but apex-ls was broken if you tried to use them.
While working on that I noticed the handling of + & - before integer and long literals was broken. To fix this requires the change in apex-dev-tools/apex-parser#29 which allows for sequences of + & - before either integer or long literals. Only alternating sequences of + and - are supported, + can be treated as a no-op as can an even number of -. Where a long control value is used the when value may be an integer but the reverse is not supported even if the long value may fit in an int.