Qt 6.0.0 is new major version for Qt and so on we don't need to
list changes to the previous Qt release but guide readers to check
porting guide.

Task-number: QTBUG-88099
Change-Id: I90c5d7467fb2051f56cec7874fd2c9f6b22be441
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

- 1465c911 Fix a UV generation bug without a shader key
+ bcd44d1c Remove a redundant shader code generation
- ec4bc7b5 Fix issue of generating uniforms for custom materials and effects
- 9ffa0990 Rename shaderInfo to shaderInformation in CustomMaterial template
- 53709d98 Do not sync renderer until the View3D component is complete
- efceeabc Add changes file for Qt 5.15.1
+ e2ab40b3 Doc: Improve intro to Qt Quick 3D
+ 6722290a Bump version

Change-Id: I6e0c6ca3ac54f9888ecf08d506f72b43543a1156
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
(cherry picked from commit 2e05e6d6)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

Change-Id: Iec9c47de819dc9337a4f31aa073ccf9e4989aa33
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
(cherry picked from commit c2201f05)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

Change-Id: I3d0ac8222138104b044926ef7f450857eeb003d9
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

Change-Id: I6f8184e93ec746ec3fa58f45e2cebee6bdeeaedd
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>