Improve errors and diagnostics · surface-ui/surface@cbda7bb

test #for language structure compile error message contains the correct line (Surface.Constructs.ForTest)

test #else language structure raises compile error with complex generator (Surface.Constructs.ForTest)

test nested if/elseif/else compile error message contains the correct line with nested struct (Surface.Constructs.IfTest)

test #unless language structure compile error message contains the correct line (Surface.Constructs.IfTest)

test #if language structure compile error message contains the correct line (Surface.Constructs.IfTest)

test raise compile error if option :slot is not a string (Surface.ComponentTest)

test keyword validate invalid literals at compile-time (Surface.PropertiesTest)

test list passing a list without brackets is invalid (Surface.PropertiesTest)

test attributes raise on shorthand notation for assigning attributes with invalid expression (Surface.Compiler.ParserTest)

test attributes raise on assigning {= ...} to an attribute (Surface.Compiler.ParserTest)

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