Add Igor Kromin's FP enhancements to FP extras repository

[azett]

Task: Check Igor Kromin's stuff at https://www.igorkromin.net/index.php/category/flatpress/ and get it overhauled into the fp-extras repository. (Thanks to Igor who explicitly likes this idea!)

Code examples: igorkromin.zip

Plugin "Blog Statistics"

• Widget "Activity graph": blogstats.php (Igor)
• Widget "Popular entries": Entries with most views (depends on PageViews plugin)
• Widget "Buzzing entries": Entries with most comments
• Widget "Random entries" -> fp-plugins/moreonblog/ (Igor) ✅

Enhance "Last Entries" plugin with optional views counter

• see viewcounter.txt (Igor)
• displaying the view counter or not should be configurable

Plugin "Download Count"

• see downloadctr-1.3.zip (Igor) ✅

Enhance "Post views" plugin with graphical widget

• see pageviewstats.php (Igor)