feat: 添加时间显示和图片查看程序并更新安装器版本

- 添加 time.lua 程序用于显示和格式化当前时间
- 添加 imageview.lua 程序用于从URL加载和显示图片
- 添加 pkg_download_en.hlp 帮助文档说明包管理功能
- 更新安装器版本号至 0.3.7 Beta 7

data/computercraft/lua/rom/programs/time.lua

@@ -0,0 +1,66 @@
+-- time.lua: Display current time
+local shell = require("shell")
+
+-- 帮助信息函数
+local function printHelp()
+  print("Usage: time [options]")
+  print("Options:")
+  print("  --help, -h       Show this help message")
+  print("  --format, -f <fmt>  Specify time format string (see below for details)")
+  print("
+Formats for --format option:")
+  print("  %Y: Year (4 digits)")
+  print("  %m: Month (01-12)")
+  print("  %d: Day (01-31)")
+  print("  %H: Hour (00-23)")
+  print("  %M: Minute (00-59)")
+  print("  %S: Second (00-59)")
+  print("  %A: Full weekday name")
+  print("  %B: Full month name")
+  print("
+Examples:")
+  print("  time                     # Show current time in default format")
+  print("  time --format '%Y-%m-%d %H:%M:%S'  # Show time as YYYY-MM-DD HH:MM:SS")
+  print("  time -f '%A, %B %d, %Y'  # Show time as 'Monday, January 01, 2023'")
+end
+
+-- 主函数
+local function main(args)
+  -- 处理命令行参数
+  local showHelp = false
+  local formatStr = "%Y-%m-%d %H:%M:%S"
+  local i = 1
+
+  while i <= #args do
+    if args[i] == "--help" or args[i] == "-h" then
+      showHelp = true
+    elseif args[i] == "--format" or args[i] == "-f" then
+      i = i + 1
+      if i <= #args then
+        formatStr = args[i]
+      else
+        print("Error: Missing format string for --format option")
+        return
+      end
+    else
+      print("Error: Unknown option '" .. args[i] .. "'\n")
+      printHelp()
+      return
+    end
+    i = i + 1
+  end
+
+  if showHelp then
+    printHelp()
+    return
+  end
+
+  -- 获取并显示当前时间
+  local currentTime = os.time()
+  local formattedTime = os.date(formatStr, currentTime)
+  print(formattedTime)
+end
+
+-- 运行主函数
+local args = {...}
+main(args)