Gr

- make perspective transformation default
- use device specific resolution for 3d software rendering
- simplify handling of user fonts
- add Retina support for iTerm2 inline graphics
- improve plot layout

[Diff since v0.57.4](https://github.com/jheinen/GR.jl/compare/v0.57.4...v0.57.5)


**Closed issues:**
- Feature request: Ignore NaN when plotting heatmaps (71)
- LoadError: InitError: Evaluation into the closed module `GR` breaks incremental compilation (390)
- "LoadError [...] Evaluation into the closed module `GR`" from "Rerunning build step for GR package." (394)
- GKSwstype vs GKS_WSTYPE (398)
- plots not showing GR 0.57.4 in linux (400)
- LaTeXStrings with Plots and (gr) not working in Jupyter (404)
- Edit on Github URL: Page not found (405)
- Showing plots with GR fails with qt cannot connecting to display error (408)
- GR.show() should do nothing unless GR.mimetype[] is not empty (411)
- GKSQT income network connections dialog (MacOS) (412)

**Merged pull requests:**
- Optimizations (397) (mkitti)
- Make pluto_data variable a String rather than a Dict reference (399) (mkitti)
- init_pluto calls GR.init() (401) (mkitti)
- Fix GR plot when using BinaryBuilder option in Windows due to spaces in the path to gksqt.exe (406) (FAlobaid)
- Fix Jupyter notebooks, add debug statements and inline documentation (407) (mkitti)

[Diff since v0.57.3](https://github.com/jheinen/GR.jl/compare/v0.57.3...v0.57.4)


**Closed issues:**
- FR: Italic capital greek letters in Latex strings (377)

**Merged pull requests:**
- Pin GR.js dependency version (389) (fonsp)
- Lazy library loading (395) (mkitti)

[Diff since v0.57.2](https://github.com/jheinen/GR.jl/compare/v0.57.2...v0.57.3)



**Merged pull requests:**
- Using Libdl.dlsym to dynamically load function pointers (388) (mkitti)

[Diff since v0.57.1](https://github.com/jheinen/GR.jl/compare/v0.57.1...v0.57.2)


**Closed issues:**
- `GKS not in proper state` error with `GR_jll` and `GR` v0.57 on Windows (383)
- Precompilation error on 1.6 with macOS 10.13 (384)

**Merged pull requests:**
- Use constants, but do `touch(pathof(GR))` (387) (mkitti)

[Diff since v0.57.0](https://github.com/jheinen/GR.jl/compare/v0.57.0...v0.57.1)


**Closed issues:**
- `GR.to_rgb_color` will raise an error if an array of identical values is given. (379)
- ERROR: could not load library "libGR.so" /usr/lib/libc.so.6: version `GLIBC_2.33' not found (381)