Fixed table.html; added filtering by DRM to index.html; apply filters via URL params

~ table.html is now fully functional; links and sorting both work now (DRM is still not visible but this is a relatively minor problem).


~ For index.html, this pull request makes it possible to sort by DRM in addition to platform and input. The DRM buttons just have text labels for now, but icons could be easily added.


~ This pull request also adds the ability to apply input or filters from the URL by adding parameters to the end (for both table.html and index.html). Documentation of this function: 

>To add a search query to the input field, set the variable "input" to your query. For index.html, you can also turn on any of the OS/DRM filters; set the variable of their name (i.e. "windows", "steam", etc) to any value and it will turn that filter on.

>For example, if you wanted to only search for DRM-Free Windows games containing the phrase "blendo", your URL would be "index.html?input=blendo&windows=1&drm-free=1"


~ This pull request also has a few minor stylistic changes (primarily to table.html) and some minor corrections to games.js.