[Rule] Templated suite should be aligned

[bhirsz]

From #808

I have decided to disable bad-indent for template suites and develop new rule that checks alignment. It should have two possible modes:

1. Align by columns (either named or not) - default mode

*** Test Cases ***                  USERNAME            PASSWORD
Invalid User Name                   [Tags]              foo
                                    invalid             ${VALID PASSWORD}
Invalid Password                    [Documentation]     foo
                                    [Tags]              bar
                                    ${VALID USER}       invalid
Invalid User Name and Password      [Tags]              baz

Example      argument=abc
             [Documentation]  Documentation text
Second test  argument=abc
             [Documentation]  Documentation text

2. Ignore alignment and check for strict 4 indent:

*** Test Cases ***
Example  argument=abc
    [Documentation]  Documentation text
Second test  argument=abc
    [Documentation]  Documentation text