Add synfigstudio 1.4.0

Original ebuilds are from bgo-overlay and eroen
Upstream appeares to have switched to autoconf

media-gfx/synfigstudio/Manifest

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+DIST synfigstudio-1.4.0.tar.gz 6423859 BLAKE2B 14577d14a33d3343e2ba014e39129a251cb6a9b5f72907509c4119a489e72fe7b8de9750dc5b7f203925e13788c82851dc1a205bf99c3ced70a084746284ff7d SHA512 31e51d16021bc72fbb3716ac344c2617d3902dbf3528673a0ce33d0b365fc0dff1aba186068805d50473f536e64d76f17bca60bb3a6a1d2323d754f6addc8986

media-gfx/synfigstudio/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+<maintainer type="person">
+	<email>ceamac.paragon@gmail.com</email>
+	<description>Primary maintainer</description>
+</maintainer>
+</pkgmetadata>

media-gfx/synfigstudio/synfigstudio-1.4.0.ebuild

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+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# Original ebuild By eroen <eroen-overlay@occam.eroen.eu>, 2018
+# Modified by <ceamac.paragon@gmail.com>, 2020
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+
+EAPI=7
+
+inherit autotools eutils multilib flag-o-matic
+
+DESCRIPTION="Vector animation studio"
+HOMEPAGE="https://www.synfig.org"
+SRC_URI="https://github.com/synfig/synfig/releases/download/v${PV}/${P}.tar.gz"
+
+LICENSE="GPL-2+ CC-BY-3.0"
+
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE=""
+
+RDEPEND="
+	media-gfx/synfig
+	dev-libs/libsigc++:2
+	dev-cpp/gtkmm:3.0
+	dev-cpp/libxmlpp:2.6
+	sys-devel/gettext
+	"
+DEPEND="${RDEPEND}
+	dev-cpp/ETL
+	virtual/pkgconfig
+	"
+
+src_prepare() {
+	eapply_user
+
+	default
+	eautoreconf
+}