reformat explore controller
Fix #559, make sitemap flat view work.
Reformat sitemap_data tool
PSR-2
Indentation fixes
Show error and inhibit installation of invalid new themes
Check page_theme.php and improve theme name/description handling

- Let's check that page_theme.php defines correct class name, namespace and inheritance
- Let's introduce two new methods: getThemeName and getThemeDescription
Handle packaged themes
Add ability to replace local install help forum url

Show the language specific installation help forum url.
marketplace updates
more work on marketplace
more work on marketplace
tweak
Merge branch 'concrete5-5.7.0-559' of https://github.com/KorvinSzanto/concrete5-5.7.0 into KorvinSzanto-concrete5-5.7.0-559
Work on pagination
resetting page limit
Merge branch 'develop' into feature-new-marketplace
updates
pagination fix
upgrade notes