Sidebar margin & spacing fixes

[yw4z]

Fixes unequal spacings and margins on sidebar

Will keep this commit as draft for a while because i did this 2 month back and need to recheck code changes

Tried to control all spacings from a single file but that required more code changes because sidebar is split to 3 files (ParamsPanel.cpp, Plater.cpp, Tab.cpp)

This method only edits numbers for spacings and adds descriptions to them

TODO

• Aligning start point of combo boxes requires a bit fine tuning

IMPORTANT CHANGES TO CHECK

This changes should be check on high res monitors
• Parameters body text alignment src/slic3r/GUI/OG_CustomCtrl.cpp

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

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
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.

• Titlebar has less margin on sides to create separation with its content
• Spacings changing on multiple filaments while it creating second row for that section. Its an existing bug
• I didnt change margins for parameter titlebars because it creates too much wasted space

COMPARISON

Before After

Before	After

ALIGNMENT PREVIEW

• I didnt change margins for parameter titlebars because it creates too much wasted space
Preview on %200 scale