Changelog for Asset Modeller 0.4.0

When adding new edge use arrow label to select edge direction. (PR, #6133)
Button for refreshing the db asset acceptor (PR, #6131)
Do not remove edge by clicking on item in connection list. (PR, #6132)
Fix broken page formatting when asset names are too long. (PR, #6132)
Add support for saving and restoring of current model. (PR, #6157)
Fix searching of available assets. (PR)
Limit ulimits in the example in README. This should solve high memory usage. (PR)
Turn off IPv6 (PR, #6088)
Change flash popup position to bottom right (PR, #6208)
Disable autocomplete on asset filter input (PR, #6207)
Trim whitespace from user-provided inputs (PR, #6206)
Introduce a ConnCase variant for unit tests (PR, #6182)
Use circular icons and coloured hover for add/remove actions (PR, #6225)
Reload model when other user restores backup (PR, #6179)