Release v1.5.9rc

This is release v1.5.9rc (release candidate)

Contains following pull requests:

Notable changes:

1. #162 Unit list in embedding tool @juhomakkonen
2. #165 Update embedding tool @juhomakkonen
3. #168 Area view list uses accordion component @juhomakkonen
4. #169 Show mobility map content in embedding tool @juhomakkonen
5. #170 Show crosswalks on the map @juhomakkonen
6. #171 Show bus stops on the map @juhomakkonen

Small changes and fixes:

1. #159 Update context logic @juhomakkonen
2. #160 Refactor mobility map fetch functionality @juhomakkonen
3. #161 Fix ref error in home logo @juhomakkonen
4. #163 Fix to units without location or geometry @juhomakkonen
5. #164 Fix to maptype change error @juhomakkonen
6. #166 Fix to error when closing embedding tool into area view @juhomakkonen
7. #167 Update sidepanel background image @juhomakkonen
8. #172 Fix to the crash of embedding tool in test server @juhomakkonen
9. #173 Update the Finnish title of the mobility map @juhomakkonen
10. #174 Show swedish school disctricts @juhomakkonen
11. #175 Update icon of the mobility map @juhomakkonen