Prepare for 7.7.0 Release (gazebosim#2292)

Signed-off-by: Addisu Z. Taddese <[email protected]>

Prepare for 6.16.0 Release (gazebosim#2284)

Signed-off-by: Addisu Z. Taddese <[email protected]>

🎈 3.15.1 (gazebosim#2279)

Signed-off-by: Michael Carroll <[email protected]>

Prepare for 8.0.0 Release (gazebosim#2181)

Signed-off-by: Addisu Z. Taddese <[email protected]>

Update changelog and prepare for pre2 release (gazebosim#2178)

Signed-off-by: Addisu Z. Taddese <[email protected]>

Prepare for 7.6.0 Release (gazebosim#2173)

Signed-off-by: Addisu Z. Taddese <[email protected]>

Merge pull request gazebosim#2103 from gazebosim/port/7_to_main

Port: 7 to main

Prepare for 6.15.0 (gazebosim#2080)

Signed-off-by: Addisu Z. Taddese <[email protected]>

🎈 7.5.0 (gazebosim#1991)

Signed-off-by: Michael Carroll <[email protected]>

Prepare for 3.15.0 Release (gazebosim#1984)

Signed-off-by: Addisu Z. Taddese <[email protected]>
Signed-off-by: Steve Peters <[email protected]>
Co-authored-by: Steve Peters <[email protected]>