Add confim box support.

enable to emulate clicking on buttons when a confirm box is showed
Add support for adding and deleting enrollment list.
Add lodash dependency.

Additionally, stop listing *.min.js library dependencies in all scripts except
for main.js. Since main.js loads them first, everyone else can simply assume
they're already present.
Remove Votr.merge(), and use buildUrl() implicitly in Link and navigate().
Add an initial version of the main menu.
Add ajax.js.
Add ZapisnyListSelector, with proof-of-concept MojeSkuskyPage.
Define actions centrally instead of each file adding its own entries.
Replace @require with automatic dependencies based on Votr.* usage.
Add ZapisnyListSelector, with proof-of-concept MojeSkuskyPage.
Implement register predmetov ui.