Sidebar margin & spacing fixes

[yw4z]

Fixes unequal spacings and margins on sidebar

Used a class in Plater.cpp to control all spacings from a single file since sidebar is split to 3 files (ParamsPanel.cpp, Plater.cpp, Tab.cpp)

IMPORTANT CHANGES TO CHECK

This changes should be check on high res monitors
• Parameters body text alignment [src/slic3r/GUI/OG_CustomCtrl.cpp]
(https://github.com/SoftFever/OrcaSlicer/pull/6238/files#diff-7fcf2f61c2e06b7e6b295588e3d5039b11dd965ce2491568cc18ff94d3aabe9e)

Line 331 wxCoord h_pos = get_title_width() * m_em_unit + 4;

Titles drawn with StaticLine.cpp and it uses 18px for icon 5px for spacing. Spacing doesnt scales on messureSize()
This line controls alignment of body text on parameters. basically added 4 to fix misalignment. static line element on titlebar using +5 and it looks on on my 2K monitor.

NOTES

Type	Spacing	Description
Titlebar_Margin	8px	Used as side margins on titlebar. Has less margin on sides to create separation with its content
Content_Margin	12px	Used as side margins contents of title
Icon_Spacing	10px	Used on main elements
Element_Spacing	5px	Used if elements has relation between them like edit button for combo box etc.

EXISTING BUG

• Spacings changing on multiple filaments while it creating second row for that section. Its an existing bug

FIXES

• Most of spacings are not stantardised. Added a standart for them
• No spacing before Machine combo box and Bed type text
• No spacing between "Compare" and "View All Object Settings" icon
• Aligned Parameter texts to it's title text

COMPARISON

Before After

Before	After

[yw4z]

@Noisyfox @SoftFever this commit also done

only im not sure about how ths change shows on high dpi screens
[src/slic3r/GUI/OG_CustomCtrl.cpp]
Line 331 wxCoord h_pos = get_title_width() * m_em_unit + 4;
Titles drawn with StaticLine.cpp and it uses 18px for icon 5px for spacing. Spacing doesnt scales on messureSize()
So +4 shoudnt make any problem