Conceptualize headers & add test cases

1. 🆕 `ParaUtil.h` with `bux::C_NumIter<>`
2. 🆕 `test/test_PO.cpp` for `PartialOrdering.h`
3. 🆕 `test/test_atomix.cpp` for `AtomiX.h`
4. ✍️ Conceptualize `Intervals.h` `PartialOrdering.h` `FA.h` and eliminate their dependencey to `<functional>`
4. ✍️ Refine function handler `bux::FH_ReadChar` in `UnicodeCvt.h` to return `std::optional<char>` insteal of **bool**
5. 🚮 Remove aged function classes `bux::FC_Parse*` from `StrUtil.h`

2 files changed, 2 insertions, 2 deletions

diff --git a/.SRCINFO b/.SRCINFO
index d3f65f4208c8..0039a9711eb8 100644
--- a/.SRCINFO
+++ b/.SRCINFO
@@ -1,6 +1,6 @@
 pkgbase = bux
 	pkgdesc = A supplemental C++ library with functionalities not directly supported from Modern C++ standard.
-	pkgver = 1.2.2
+	pkgver = 1.3.0
 	pkgrel = 1
 	url = https://github.com/buck-yeh/bux.git
 	arch = x86_64
diff --git a/PKGBUILD b/PKGBUILD
index b1c731ccc898..ff459c994f43 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -5,7 +5,7 @@
 
 # Maintainer: Buck Yeh <buck.yeh at gmail dot com>
 pkgname=bux
-pkgver=1.2.2
+pkgver=1.3.0
 #pkgver=main
 pkgrel=1
 epoch=