Merge pull request #203 from NamelessCoder/paths

[BUGFIX] Ensure absolute paths and array variables returned from Providers
[TASK] Condition require-file statement for no longer existing file
Merge pull request #206 from NamelessCoder/62compat

[TASK] Condition require-file statement for no longer existing file
[TASK] Functional test for TceMain class
[TASK] Adapt a fixture template to use proper arguments
[TASK] Functional test for Preview renderer