Initial pass at new stacktrace rendering

[dcramer]

• New cell-based stack rendering
• Hide line numbers and "application" notation
• Add PHP specific rendering
• Remove legacy CSS
• Left-truncate filenames (expand on hover)
• Add clipping to stack locals
• Prevent propagation of clicks on ClippedBox
• Dont collapse context on click (require header click)

TODO:

• add way to expand/collapse stack locals
• add way to expand/collapse all frames
• tweak frame header details to be more concise based on language
• confirm cocoa isn't broken
• finalize visuals
• indicator for app vs non-app frames
• improve visuals when only single context line (remove active highlight?)
• improve mouseover effects (no cursor) when no context
• improve visuals around filename + function (truncation is awful in some cases like Java)
• disable expand/collapse behavior when no context
• rename "App Only" to "Focused" or something similar

@getsentry/ui

[dcramer]

This is unfinished and I have not yet tested Cocoa

[dcramer]

This is live on staging

[dcramer]

@mitsuhiko is going to put this behind a feature switch

[mitsuhiko]

@dcramer should we roll this out?

[dcramer]

+1 -- we can probably push to staging without the switch enabled to make sure nothings butchered, but as long as we haven't regressed on the existing rendering no complaints here