add scripts to run some games on *nix

run-ep1.sh

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+HL2DIR="$HOME/.local/share/Steam/steamapps/common/Half-Life 2"
+EPDIR="$HL2DIR/episodic"
+
+./build/desktop-rel-cc/OpenSource \
+	-d "$EPDIR" \
+	-p "$EPDIR/ep1_pak_dir.vpk" \
+	-p "$HL2DIR/hl2/hl2_pak_dir.vpk" \
+	-p "$HL2DIR/hl2/hl2_misc_dir.vpk" \
+	-p "$HL2DIR/hl2/hl2_textures_dir.vpk" \
+	-n 128 \
+	ep1_c17_00

run-ep2.sh

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+HL2DIR="$HOME/.local/share/Steam/steamapps/common/Half-Life 2"
+EP2DIR="$HL2DIR/ep2"
+
+./build/desktop-rel-cc/OpenSource \
+	-d "$EP2DIR" \
+	-p "$EP2DIR/ep2_pak_dir.vpk" \
+	-p "$HL2DIR/hl2/hl2_pak_dir.vpk" \
+	-p "$HL2DIR/hl2/hl2_misc_dir.vpk" \
+	-p "$HL2DIR/hl2/hl2_textures_dir.vpk" \
+	-n 128 \
+	ep2_outland_01

run-hl1.sh

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+HL2DIR="$HOME/.local/share/Steam/steamapps/common/Half-Life 2"
+HL1DIR="$HL2DIR/hl1"
+
+./build/desktop-rel-cc/OpenSource \
+	-d "$HL1DIR" \
+	-p "$HL1DIR"_hd/hl1_hd_pak_dir.vpk \
+	-p "$HL1DIR/hl1_pak_dir.vpk" \
+	-p "$HL2DIR/hl2/hl2_misc_dir.vpk" \
+	-p "$HL2DIR/hl2/hl2_textures_dir.vpk" \
+	-n 128 \
+	c0a0a

run-portal.sh

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+BASEDIR="$HOME/.local/share/Steam/steamapps/common/Portal"
+HL2DIR="$BASEDIR/hl2"
+PDIR="$BASEDIR/portal"
+
+./build/desktop-rel-cc/OpenSource \
+	-d "$PDIR" \
+	-p "$PDIR/portal_pak_dir.vpk" \
+	-p "$HL2DIR/hl2_misc_dir.vpk" \
+	-p "$HL2DIR/hl2_textures_dir.vpk" \
+	-n 128 \
+	testchmb_a_00