refactoring

- overlays/{linux,wine-osu}.nix -> packages/{linux-lava,wine-osu}/
- overlays/misc/ -> overlays/patches/
- overlays/misc/0001...patch -> packages/linux-lava/si...patch
- overlays/misc/wine/ -> packages/wine-osu/patches/
- flake.nix:
  - overlays are dynamically read from overlays/
  - define custom packages separately
- packages/*
  - now imported using callPackage

overlays/patches/startx.patch

@@ -0,0 +1,26 @@
+diff --git a/startx.cpp b/startx.cpp
+index 125c398..296b29f 100644
+--- a/startx.cpp
++++ b/startx.cpp
+@@ -47,10 +47,10 @@ XCOMM so export the new PATH just in case the user changes the shell
+ export PATH
+ #endif
+ 
+-userclientrc=$HOME/.xinitrc
++userclientrc="${XINITRC:-$HOME/.xinitrc}"
+ sysclientrc=XINITDIR/xinitrc
+ 
+-userserverrc=$HOME/.xserverrc
++userserverrc="${XSERVERRC:-$HOME/.xserverrc}"
+ sysserverrc=XINITDIR/xserverrc
+ defaultclient=XTERM
+ defaultserver=XSERVER
+@@ -270,7 +270,7 @@ if [ x"$enable_xauth" = x1 ] ; then
+     dummy=0
+ 
+     XCOMM create a file with auth information for the server. ':0' is a dummy.
+-    xserverauthfile=$HOME/.serverauth.$$
++    xserverauthfile=$XAUTHORITY
+     trap "rm -f '$xserverauthfile'" HUP INT QUIT ILL TRAP KILL BUS TERM
+     xauth -q -f "$xserverauthfile" << EOF
+ add :$dummy . $mcookie

overlays/patches/transcrypt.patch

@@ -0,0 +1,45 @@
+diff --git a/transcrypt b/transcrypt
+index 610b94f..7cc5035 100755
+--- a/transcrypt
++++ b/transcrypt
+@@ -282,6 +282,7 @@ save_helper_scripts() {
+ 
+ 	cat <<-'EOF' >"${GIT_DIR}/crypt/clean"
+ 		#!/usr/bin/env bash
++		PATH="$(transcrypt-depspathprefix 2>/dev/null)$PATH"
+ 		filename=$1
+ 		# ignore empty files
+ 		if [[ -s $filename ]]; then
+@@ -304,6 +305,7 @@ save_helper_scripts() {
+ 
+ 	cat <<-'EOF' >"${GIT_DIR}/crypt/smudge"
+ 		#!/usr/bin/env bash
++		PATH="$(transcrypt-depspathprefix 2>/dev/null)$PATH"
+ 		tempfile=$(mktemp 2>/dev/null || mktemp -t tmp)
+ 		trap 'rm -f "$tempfile"' EXIT
+ 		cipher=$(git config --get --local transcrypt.cipher)
+@@ -313,6 +315,7 @@ save_helper_scripts() {
+ 
+ 	cat <<-'EOF' >"${GIT_DIR}/crypt/textconv"
+ 		#!/usr/bin/env bash
++		PATH="$(transcrypt-depspathprefix 2>/dev/null)$PATH"
+ 		filename=$1
+ 		# ignore empty files
+ 		if [[ -s $filename ]]; then
+@@ -324,6 +327,7 @@ save_helper_scripts() {
+ 
+ 	cat <<-'EOF' >"${GIT_DIR}/crypt/merge"
+ 		#!/usr/bin/env bash
++		PATH="$(transcrypt-depspathprefix 2>/dev/null)$PATH"
+ 
+ 		# Look up name of local branch/ref to which changes are being merged
+ 		OURS_LABEL=$(git rev-parse --abbrev-ref HEAD)
+@@ -459,7 +463,7 @@ save_configuration() {
+ 	git config merge.crypt.name 'Merge transcrypt secret files'
+ 
+ 	# add a git alias for listing encrypted files
+-	git config alias.ls-crypt "!git -c core.quotePath=false ls-files | git -c core.quotePath=false check-attr --stdin filter | awk 'BEGIN { FS = \":\" }; /crypt$/{ print \$1 }'"
++	git config alias.ls-crypt "!PATH=\"\$(transcrypt-depspathprefix 2>/dev/null)\$PATH\"; git -c core.quotePath=false ls-files | git -c core.quotePath=false check-attr --stdin filter | awk 'BEGIN { FS = \":\" }; /crypt$/{ print \$1 }'"
+ }
+ 
+ # display the current configuration settings