deprecate_bad_module_name.dd

Deprecate import module name mismatch

Some instances of module name/import name mismatches were deprecated while others are now considered errors.

Case 1: DEPRECATED: import a module name with a qualified name but the module being imported has no module declaration.
---
// main.d
import foo.bar;

// foo/bar.d
// this file is empty, it has no module declaration
---
The above code will now print:

$(CONSOLE Deprecated: module bar from file foo/bar.d should be imported with 'import bar;' )

Case 2: DEPRECATED: import a module with a qualified name that partially matches the name of the module being imported.
---
// main.d
import foo.bar;
import foo.baz.buz;

// foo/bar.d
module bar;

// foo/baz/buz.d
module baz.buz;
---
The above code will now print:

$(CONSOLE Deprecated: module bar from file foo/bar.d should be imported with 'import bar;'
Deprecated: module baz.buz from file foo/baz/buz.d should be imported with 'import baz.buz;' )

Note that for this rule to apply, the shorter name must completely match the end of the longer name.

Case 3: ERROR: import a module that matches the filename but does not match the module name.
---
// main.d
import foo;

// foo.d
module bar;
---
The above code will now fail and print:

$(CONSOLE Error: module bar from file foo.d must be imported with 'import bar;')

Note that importing a module whose module name does not match its filename is still supported.