Add a global convenience package file

Author: wilzbach

changelog/import-std.dd

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+`import std` as a global convenience import
+
+For short scripts a lot of imports are often needed to get all the
+modules from the standard library.
+With this release it's possible to use `import std` for importing the entire
+standard library at once. This can be used for fast prototyping or REPLs:
+
+---
+import std;
+void main()
+{
+    6.iota
+      .filter!(a => a % 2) // 0 2 4
+      .map!(a => a * 2) // 0 4 8
+      .tee!writeln
+      .sum
+      .reverseArgs!writefln("Sum: %d"); // 18
+}
+---
+
+As before, symbol conflicts will only arise if a symbol with collisions is used.
+In this case, $(LINK2 $(ROOT)spec/module.html#static_imports, static imports) or
+$(LINK2 $(ROOT)spec/module.html#renamed_imports, renamed imports) can be used
+to uniquely select a specific symbol.

changelog/std-experimental-scripting.dd

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+`std.experimental.scripting` has been added
+
+$(MREF std,experimental,scripting) allows to conveniently use all Phobos modules
+with one import:
+
+---
+import std.experimental.scripting;
+void main()
+{
+    10.iota.map!log.sum.writeln;
+}
+---
+
+Importing entire Phobos costs about half a second (varying on the system) and
+work is in progress to reduce this overhead even further.

std/experimental/scripting.d

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+/++
+Phobos is the D standard library, built on top of druntime.
+
+Convenience file that allows to import entire Phobos in one command.
++/
+module std.experimental.scripting;
+public import std.algorithm;
+public import std.array;
+public import std.ascii;
+public import std.base64;
+public import std.bigint;
+public import std.bitmanip;
+public import std.compiler;
+public import std.complex;
+public import std.concurrency;
+public import std.container;
+public import std.conv;
+public import std.csv;
+public import std.datetime;
+public import std.demangle;
+public import std.digest;
+public import std.encoding;
+public import std.exception;
+public import std.file;
+public import std.format;
+public import std.functional;
+public import std.getopt;
+public import std.json;
+public import std.math;
+public import std.mathspecial;
+public import std.meta;
+public import std.mmfile;
+public import std.net.curl;
+public import std.numeric;
+public import std.outbuffer;
+public import std.parallelism;
+public import std.path;
+public import std.process;
+public import std.random;
+public import std.range;
+public import std.regex;
+public import std.signals;
+public import std.socket;
+public import std.stdint;
+public import std.stdio;
+public import std.string;
+public import std.system;
+public import std.traits;
+public import std.typecons;
+//public import std.typetuple; // this module is undocumented and about to be deprecated
+public import std.uni;
+public import std.uri;
+public import std.utf;
+public import std.uuid;
+public import std.variant;
+public import std.xml;
+public import std.zip;
+public import std.zlib;