add unittests for loading of defaults, extra defaults, local and protected settings

disable update check by default during tests

This should speed up integration tests that use our TestRequest
mechanism

Use config cascade for style.ini files

This simplifies style loading and allows the plugins like farmer to
extend the the loading of style files. Also adds some first unit tests.

Originally discuss

Use config cascade for style.ini files

This simplifies style loading and allows the plugins like farmer to
extend the the loading of style files. Also adds some first unit tests.

Originally discussed in FS#2703 and #134

Squashed commit of the following:

commit 5ed550f6ba61a1d475b7572cbff18f0d790c78c2
Merge: 0cefed65e cab1833b0
Author: Andreas Gohr <gohr@cosmocode.de>
Date: Thu Feb 28 13:38:46 2019 +0100

Merge branch 'styleConfCascade' of https://github.com/annda/dokuwiki into annda-styleConfCascade

* 'styleConfCascade' of https://github.com/annda/dokuwiki:
Clean up StyleUtils
Update StyleUtils test
Fix array to boolean conversion
Use better placeholder string in config cascade
Calls to StyleUtils use the new constructor
Add test for StyleUtils
Refactor StyleUtils
WIP add temporary test comparing two implementations of StyleUtils
WIP add new style config cascade side by side with the old one

commit cab1833b09a59331a5580fe0e3e6f36d743dea09
Author: Anna Dabrowska <dabrowska@cosmocode.de>
Date: Thu Feb 21 17:54:27 2019 +0100

Clean up StyleUtils

commit 766e3907cf7b234c3f2fa7bf86f205c1c8c7c6e1
Author: Anna Dabrowska <dabrowska@cosmocode.de>
Date: Thu Feb 21 17:51:15 2019 +0100

Update StyleUtils test

commit f5c08787ddf9db60e3429421e5c627d5c81d876a
Author: Anna Dabrowska <dabrowska@cosmocode.de>
Date: Thu Feb 21 12:51:53 2019 +0100

Fix array to boolean conversion

commit c9671698992328d5671a43b2707ffc6c5b117423
Author: Anna Dabrowska <dabrowska@cosmocode.de>
Date: Thu Feb 21 12:38:55 2019 +0100

Use better placeholder string in config cascade

commit 4845eff54d227325476bb00b7c8402ce58cf72df
Author: Anna Dabrowska <dabrowska@cosmocode.de>
Date: Thu Feb 21 12:24:16 2019 +0100

Calls to StyleUtils use the new constructor

commit 7a6337a8f8f2cc0cedbf54ae0b43e94033192cb8
Author: Anna Dabrowska <dabrowska@cosmocode.de>
Date: Thu Feb 21 12:22:44 2019 +0100

Add test for StyleUtils

commit 5ae9e8f69e076ab2a18b24aa178cca15fea6b000
Author: Anna Dabrowska <dabrowska@cosmocode.de>
Date: Thu Feb 21 12:16:57 2019 +0100

Refactor StyleUtils

commit a2adcc9f37be93f4bcf90fdba4089ea4b0d6436e
Author: Anna Dabrowska <dabrowska@cosmocode.de>
Date: Sat Feb 16 23:58:04 2019 +0100

WIP add temporary test comparing two implementations of StyleUtils

commit 845c40c4faf379a65134e171514a09d47ffe95f1
Author: Anna Dabrowska <dabrowska@cosmocode.de>
Date: Sat Feb 16 23:59:41 2019 +0100

WIP add new style config cascade side by side with the old one

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