Gpencil Noise - Add noise offset parameter

This patch adds a noise offset option to the grease pencil noise modifier.
It allows the user to animate the noise along the length of the stroke to create movement that is currently not possible.

It works by adding an offset to the noise table and adding the remaining floating point value to the noise table sampling.

Reviewed By: #grease_pencil

Differential Revision: https://developer.blender.org/D10021

GPencil: Noise Modifier - Move noise seed value outside of randomize subpanel

Currently the grease pencil noise modifier seed value is under the randomize subpanel.

Moved the seed value outside of this panel because it doesn't only change the noise when using the randomize option. Moving the seed value prevents it from being hidden/greyed out so the user can manually keyframe it to control the noise animation.

Reviewed By: #grease_pencil, antoniov

Differential Revision: https://developer.blender.org/D10020

GPencil Array - Add option for uniform random scaling

This patch adds the option to make the random scaling from the grease pencil array modifier uniform.
The current settings allow a separate value for each of the 3 scaling axis. The modifier also creates different seed values for each axis so there is no way to keep the random scaling uniform.
This patch creates 1 random seed value and applies it to each of the scaling axis.

Here is a demonstration of the previous behavior and the new optional behavior.
{F9485973}
{F9485981}

{F9485798}

Reviewed By: #grease_pencil, antoniov, pepeland

Differential Revision: https://developer.blender.org/D9764

Fix invert vertex group weight miscalculation for modifiers

Warp & weight vertex-group editing modifiers miscalculated vertex weight
inversion, the weights were multiplied before being subtracted from 1.

Ref D8241

Fix invert vertex group weight miscalculation for modifiers

Warp & weight vertex-group editing modifiers miscalculated vertex weight
inversion, the weights were multiplied before being subtracted from 1.

Ref D8241

Modifiers: option to preserve custom normals for subsurf & multires

Fix: Displace Modifier UV Layer UI not a pointer

The displace modifier's uv_layer property should be a pointer in the new
UI like the other modifiers use.

Differential Revision: https://developer.blender.org/D7990

Fix: Array modifier start cap not updating with object changes

When setting the start cap of the array modifier it does not update when
updating the start cap objects geometry.

This patch switches the property update to rna_Modifier_dependency_update,
the same as the end cap which works properly.

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D7584

Modifiers: Add normalize weights option to vertex weight modifiers

Original patch by Cody Winchester (@CodyWinch), several fixes and
cleanup by Bastien Montagne (@mont29).

Differential revision: https://developer.blender.org/D7656

GPencil: Add Texture modifier

This patch aims to add a new modifier for grease pencil objects that gives more control over the strokes texture UVs.

There are 3 modes.
1 Control the stroke texture UVs alone
2 Control the fill texture UVs alone
3 Control both the fill and stroke texture UVs

For the stroke texture UVs there are 2 options for fitting the texture to the stroke.
1 The texture uvs are kept a consistent length how it currently is set by default.
2 The uvs are normalized to fit the length of the stroke regardless of how long or short it gets allowing the texture to fit the length of the stroke.

There are then 2 controls to scale up and down the uvs and an offset value that allows moving the texture along the stroke.

For the fill texture UVs it includes all of the transformational controls. Location offset, scale, and rotation.

Reviewed By: antoniov, mendio

Differential Revision: https://developer.blender.org/D7439