Versions 0.10 - 0.10.3

This set of updates makes the following changes (most of them are only relevant for moderators and admins):

• Add manage competitors page
• Update the edit result feature, making it directly edit the result instead of deleting it and copying the result to the inputs
• Show confirmation dialog before deleting a result
• Scroll to the top of the data entry page when clicking edit on a result
• Refactor the moderator dashboard, making it a little easier to use
• Add feature for entering multiple results at once to the external API (thanks, @maxidragon!)
• Allow external data entry using the competitor's WCA ID
• Send email to the person who submitted a video-based result when their result gets approved
• Refactor a lot of code, fix bugs, make optimizations, write more tests