tools: use expansion character/string to format home paths in vpm output

[ttytm]

E.g.

# On Lin/mac
Updating `sdl` in `/home/username/.vmodules/sdl`
# would become
Updating `sdl` in `~/.vmodules/sdl`

# On Windows
Updating `sdl` in `C:\Users\username\.vmodules\sdl`
# would become
Updating `sdl` in `%USERPROFILE%\.vmodules\sdl`

🤖 Generated by Copilot at eca32a9

Improved the output and user experience of vpm by adding formatted paths, colors, alignment, and progress indicators. Modified the Module struct and several functions in cmd/tools/vpm/common.v, cmd/tools/vpm/install.v, and cmd/tools/vpm/update.v.

🤖 Generated by Copilot at eca32a9

• Add a new field install_path_fmted to the Module struct to store a formatted version of the vmodules install path (link, link, link)
• Define a new constant home_dir to store the result of os.home_dir() function and avoid repeated calls (link)
• Define a new function fmt_mod_path to format the vmodules install path by replacing the home directory with a tilde or an environment variable depending on the OS (link)
• Use the install_path_fmted field instead of the install_path field in the output messages of the relocate, install, remove, and update functions in install.v and update.v to make the output more user-friendly and consistent (link, link, link, link, link, link)