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

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 #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 raise error if there's no {#match} sub-blocks (Surface.Constructs.CaseTest)

test raise error if default sub-block has content (Surface.Constructs.CaseTest)

test modifiers raise compile error for modifiers with multiple clauses (Surface.DirectivesTest)

test :props for a component raise if trying to assisn `{... }` to a property (Surface.DirectivesTest)

test :attrs in html tags raise if trying to assisn `{... }` to an attribute (Surface.DirectivesTest)

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