Added fzf, exiftool, unar (#1374)

* Added fzf, exiftool, unar
* Expand tabs to spaces; remove UTF-8 BOM header bytes; passed pester
* Set $version to autoupdate
* Add checkver
* Fix checkver
* add architecture in checkver
* Make sure checkver work on the latest stable fzf for Windows

exiftool.json

@@ -0,0 +1,10 @@
+{
+    "homepage":  "http://www.sno.phy.queensu.ca/~phil/exiftool/index.html",
+    "version":  "10.46",
+    "license":  "http://dev.perl.org/licenses/",
+    "url":  "https://downloads.sourceforge.net/project/exiftool/exiftool-10.46.zip",
+    "hash":  "1258490d42368887d92654fe2ed2475fe99acf684827fb3e73cda4f0d2c3ef09",
+    "bin":  [
+        ["exiftool(-k).exe", "exiftool"]
+    ]
+}

fzf.json

@@ -0,0 +1,29 @@
+{
+    "homepage":  "https://github.com/junegunn/fzf",
+    "version":  "0.16.5",
+    "license":  "MIT",
+    "architecture": {
+        "64bit": {
+            "url":  "https://github.com/junegunn/fzf-bin/releases/download/0.16.5/fzf-0.16.5-windows_amd64.zip",
+            "hash":  "bf0b47c2a69ca86da552dbd5d483b567ee6b3b5b9b683268e3b4485a4884e914"
+        },
+        "32bit": {
+            "url": "https://github.com/junegunn/fzf-bin/releases/download/0.16.5/fzf-0.16.5-windows_386.zip",
+            "hash": "a4d5442a30b8a7af41f86377cb6da01ab07a1c2571c18cb75a46c84342eadf71"
+        }
+    },
+    "bin":  "fzf.exe",
+    "checkver": {
+        "github": "https://github.com/junegunn/fzf-bin"
+    },
+    "autoupdate": {
+        "architecture": {
+            "64bit": {
+                "url":  "https://github.com/junegunn/fzf-bin/releases/download/$version/fzf-$version-windows_amd64.zip"
+            },
+            "32bit": {
+                "url": "https://github.com/junegunn/fzf-bin/releases/download/$version/fzf-$version-windows_386.zip"
+            }
+        }
+    }
+}

unar.json

@@ -0,0 +1,9 @@
+{
+    "homepage": "https://unarchiver.c3.cx/commandline",
+    "license": "GPL2.1",
+    "version": "1.8.1",
+    "url": ["http://unarchiver.c3.cx/downloads/unar1.8.1_win.zip"],
+    "hash":["2fa1ea5ddc2b2615b94b2d00cd19fcbf9165cffb5346e83d3b2643e7a55c1e95"],
+    "extract_dir": ".",
+    "bin": ["lsar.exe", "unar.exe"]
+}